External thermal insulation not only solves the problem of thermal insulation, but also reduces the thickness of the wall that is too rich for mechanical requirements and reduces the cost of civil construction. External thermal insulation is the most effective energy-saving method to achieve building energy conservation. As an application of exterior facing materials, building thermal insulation coatings are still the first choice.
In China, the external wall insulation system that has been matured and recommended is: polystyrene board thin plastering external wall thermal insulation system, rubber powder polystyrene particle thermal insulation slurry external wall thermal insulation system, cast-in-place concrete composite no net Polystyrene board external wall insulation system, cast-in-place concrete composite polystyrene board steel wire mesh panel external wall insulation system, mechanical fixed polystyrene board steel grid plate external wall insulation system. In addition, external thermal insulation systems such as rock wool, polyurethane, and extruded polystyrene board have also been developed and applied. Building energy conservation in western Europe and the United States, the widely used external wall thermal insulation system is mainly a thin plastering method for external thermal insulation board. There are two kinds of thermal insulation materials: flame retardant expanded polystyrene board and non-combustible rock wool board. The coating is an outer layer. The application of the external insulation system in Europe was originally designed to compensate for wall cracks.
The external wall thermal insulation coating has low thermal conductivity, easy construction, oil resistance, acid resistance, alkali resistance and low pollution coefficient. It is the most ideal thermal insulation material in the external wall insulation industry. There are many kinds of exterior wall insulation coatings, such as ceramic thermal insulation coatings, hydrophobic silicon thermal insulation coatings, and polystyrene granule exterior wall insulation coatings. The ceramic thermal insulation coating is a water-based liquid coating. It is prepared by pre-treatment and high-quality emulsion of ultra-fine hollow ceramic micro-beads. It has extremely high heat reflectivity and emissivity, which can effectively reduce the summer cooling of buildings. Heating energy consumption in winter. The hydrophobic water-based thermal insulation coating is made of high-quality sepiolite, aluminum silicate fiber, expanded perlite, silicone and other high-quality thermal insulation materials and high-molecular polymer. It has excellent thermal insulation properties and is widely used in walls. Insulation of body, tank, cold storage, pipeline, etc. Rubber powder polystyrene particle exterior wall insulation coating is a new type of insulation material, composed of two main components: rubber powder and polystyrene particles.
At present, relatively good exterior wall thermal insulation coatings have good weather resistance, low thermal conductivity, stable thermal insulation performance, high softening coefficient, resistance to freezing and thawing, anti-aging; strong adaptability of base layer deformation, effectively preventing wall cracks; The system has no cavity and strong anti-negative wind pressure. It is suitable for multi-layer and high-rise buildings. It has good air permeability and strong breathing function. It has good waterproof function and can remove the moisture of the insulation layer. It is convenient and fast. It can be multi-layered and multi-faceted; the fire resistance can reach many comprehensive advantages such as B1 and above.
High Temperature Alloy is divided into three kinds of material: 760 ℃ high-temperature material, 1200℃ high temperature and 1500 ℃ high temperature materials, the tensile strength is 800 mpa. On other words,it refers to the metal material worked well in the condition of 760-1500 ℃ or above. It owns excellent high temperature strength, good resistance to oxidation and thermal corrosion resistance, good fatigue properties, fracture toughness and other comprehensive performance, this kind of material has became an irreplaceable key material in military and civilian gas turbine engine hot end components . According to the relevant theory, 760 ℃ high-temperature materials, according to the matrix elements,can be mainly divided into high temperature iron base alloy, nickel base superalloy and cobalt-based super alloy. According to the preparation process,it can be divided into deformation and high temperature alloy, casting high temperature alloy and powder metallurgy super alloy. According to the solid methods,it can be divided into solid solution strengthening, precipitation strengthening and oxide dispersion strengthened with fiber reinforced type, etc.
High Temperature Alloy
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